Ezekiel 46:21-24

21And he brought me forth into the outer court, and caused me to pass by the four corners of the court; and behold, in every corner of the court there was a court. 22In the four corners of the court there were enclosed courts, forty [cubits] long and thirty broad: these four corner courts were of one measure. 23And there was a row [of building] round about in them, round about those four, and it was made with boiling places under the rows round about. 24And he said unto me, These are the boiling-houses, where those who do the service of the house shall boil the sacrifice of the people.